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CVE-2011-3621

30
FAUCET Score

CVE-2011-3621 describes a critical reverse proxy vulnerability in FluxBB versions prior to 1.4.7, specifically when the FORUM_BEHIND_REVERSE_PROXY setting is enabled. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low complexity, allowing for complete compromise of confidentiality, integrity, and availability. Despite its high severity, there is no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.7CPE matchmatch criteria
cpe:2.3:a:fluxbb:fluxbb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.20%
Probability of exploitation in next 30 days
EPSS Percentile
64.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0120 is in the 51st percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

fluxbb.org / forums/viewtopic.php
Vendor Advisory
openwall.com / lists/oss-security/2011/10/18/8
Mailing ListThird Party Advisory